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Passing info from one chain to the next -- this does not work
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| from operator import itemgetter | |
| from langchain.chat_models import ChatVertexAI | |
| from langchain.prompts import PromptTemplate | |
| from langchain.schema import StrOutputParser | |
| from langchain.schema.vectorstore import VectorStoreRetriever | |
| ## Chain1 | |
| # The input is {"input": "Some question written by a user"} | |
| some_model1 = ChatVertexAI(model_name="codechat-bison", max_output_tokens=2048) | |
| some_prompt1 = PromptTemplate(input_variables=["question", "context"], prompt="...") | |
| question = {"question": itemgetter('input')} # we rename to question | |
| # Get just one doc | |
| retriever: VectorStoreRetriever = vector_store.as_retriever(search_kwargs={'k': 1}) | |
| docs = {"context": RunnableLamnda(lambda x: retriever.get_documents(x["input"])[0])} | |
| output_chain1 = question | docs | some_prompt | some_model1 | StrOutputParser() | |
| ## Chain 2 | |
| some_model2 = ChatVertexAI(max_output_tokens=2048) | |
| some_prompt2 = PromptTemplate(input_variables=["question", "context", "output"], prompt="...") | |
| # ERROR: the input does not the "input" key anymore, and both question and docs will fail | |
| chain2 = question | docs | {"output": output_chain1} | some_prompt2 | some_model2 | StrOutputParser() |
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